Have red pimples and pus filled bump on back of neck. Am I having any infection?

I have a red almost pimple like bump on the back of my neck behind the ear, it almost looks like a spider bite . There s a few very small bumps within the big bump with what looks like puss, it looks infected and scaling. About an inch down from where that is I have a small bump under the skin, almost cist like, I m wondering if maybe it has any correlation to the infection.